curl --request POST \
  --url https://api.justpaid.io/api/v1/usage/billable_metrics/create \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "<string>",
  "description": "<string>",
  "event_name": "<string>",
  "aggregation_type": 0
}'

{
  "uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z",
  "name": "<string>",
  "description": "<string>",
  "event_name": "<string>",
  "aggregation_type": 0
}